The phrase "set on" means to become firmly fixed in an opinion or course of action, and is typically used when describing a change in behavior. Full definition
As long as you don't get your heart set on getting the exact same play that you loved about the original you'll be leaving happy. (metacritic.com)
If you have your sights set on making a great living and living a great life as a lawyer, it's likely there are market place barriers standing in your way. (legalmarketingforlawyers.com)
More than half of homeowners who planned to renovate their kitchens had their eyes set on changing their appliances. (rismedia.com)